<template>
  <div class="login_container">
    <div class="login_body">
      <!-- 头部头像 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单 -->
      <el-form :model="loginForm" :rules="loginFormRules" ref="loginFormRef" label-width="0px" class="login_form">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginForm.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-3702mima" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <!-- 登录重置 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLogin">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      // 绑定的用户登录信息
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      // 登录规则验证
      loginFormRules: {
        // 用户名验证规则
        username: [
          { required: true, message: '请输入用户名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        // 用户名验证规则
        password: [
          { required: true, message: '请输入用户密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 重置规则信息和表单信息
    resetLogin() {
      // 重置校验结果
      this.$refs.loginFormRef.resetFields()
    },
    // 登录
    login() {
      // 对整个表单预验证
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return // 如果验证失败则不发送ajax请求
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功！')
        // 1.登录成功后把 token 值保存到客户端的sessionStorage中
        //   1.1 项目中除了登录之外的其他api接口，必须在登录之后才能访问
        //   1.2 token 只应在当前网站打开时生效，所有保存到sessionStorage
        window.sessionStorage.setItem('token', res.data.token)
        // 2.通过编程式导航跳转home组件
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  height: 100%;
  background: #2b4b6b;

  .login_body {
    width: 450px;
    height: 300px;
    background: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background: #eee;
      }
    }

    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;

      .btns {
        display: flex;
        justify-content: flex-end;
      }
    }
  }
}
</style>
